TWM508836U - A wireless charging coil PCB structure - Google Patents

Abstract

A wireless charging coil PCB structure comprising at least one first coil is disposed on a first layer of printed circuit board (PCB), and a center or peripheral of the first coil is a first non-wires zone; at least one second coil is disposed on a second layer of PCB, and a center or peripheral of the second coil is a second non-wires zone; a plurality of first conductor pattern in the first non-wires zone, corresponding to the portion of the second coil; and a plurality of second conductor pattern in the second non-wires zone, corresponding to the portion of the first coil. Wherein a plurality of electrically connecting points are setting between the first conductor and the second coil, and electrically connected in parallel to the first conductor and the portion of the second coil. Wherein a plurality of electrically connecting points are setting between the second conductor and the first coil, and electrically connected in parallel to the second conductor and the portion of the first coil. So as maybe increase the amount of charge in the coil, and reducing resistance to overcome "Proximity Effect", and adjusted/balance/increase the inductance value (Ls) of the all coil by the amount of the conductor in the non-wires zone.

Description

Wireless charging printed circuit board coil structure

The present invention is a wireless charging printed circuit board coil structure, and more particularly to a coil structure that can solve the wireless charging transmission end of the "Proximity Effect" between coils.

Wire-Less Charger (WLC) technology is a method of transmitting power charging technology by using electromagnetic induction without using a power line. As shown in FIG. 1 , it is a schematic diagram of a conventional wireless charging transmission, including a power transmission module 10 and a power receiving module 20 . The power transmission sensing module 10 has a transmitting end coil 11 and a transmitting end sensing. The power receiving and sensing module 20 also has a receiving end coil 21 and a receiving end core plate 22. When the power receiving module 20 is close to the power transmitting module 10, a current flows through the transmitting end coil 11 of the power transmitting sensing module 10 to generate a magnetic field, so that the receiving end coil 21 of the power receiving sensing module 20 senses the magnetic field. Generate current.

The high-end wireless charging module will be made into a larger charging range sensing board at the power transmitting end, and the power receiving device of the charged end can be charged smoothly regardless of where it is placed on the sensing board, without being placed in a fixed position. Therefore, the wireless charging transmitting end sets a plurality of sets of coils covering the charging range, such as two sets of coils, three sets of coils, and the like.

Since the number of turns of the coil and the inductance of the coil are related to the transmission frequency of the wireless charging, and the center portion of the winding of the transmitting end coil 11 forms the induced window portion 13, generally another group of transmitting end coils 11' are arranged. Above the transmitting end coil 11, as shown in FIG. 2 is a schematic diagram of a transmitting end sensing board 12 having two sets of coils, that is, one transmitting end coil 11 is placed on the upper surface of the sensing board, and the other transmitting end coil 11 is shown. 'The square is placed on the lower surface of the sensing plate, and a part of the transmitting end coil 11 of the upper surface passes through the central hollow window region 13' of the transmitting end coil 11' of the lower surface, and the transmitting end coil 11' of the opposite lower surface also There is a portion of the central open window region 13 passing through the transmitting end coil 11 of the upper surface.

FIG. 3 is a schematic diagram of an induction board having three sets of coils. FIG. 4 is a side view of the sensor board of FIG. 3, and the three sets of coils in FIG. 3 and FIG. 4 are arranged in a vertical shape, such as transmission. The transmitting end coil 11' on the upper surface of the end sensing plate 12 is arranged in the middle of the other two sets of transmitting end coils 11" on the lower surface of the transmitting end sensing plate 12, so that the transmitting end coil 11' has a part passing through the lower two sets of transmitting end coils. 11" center empty window area 13. Similarly, the four-group, five-group or more coils can use the multi-layered transmission end sensing board 12, and the arrangement is also analogous to the three groups, and therefore will not be described again.

In FIG. 4, in order to reduce the overall height of the wireless charging module, a multi-layer printed circuit is generally used to manufacture a plurality of sets of staggered stacked coils, wherein the transmitting end sensing plates 12 of the three sets of transmitting end coils 11', 11" are Will be placed in one On the core plate (not shown), the upper end is covered with a top plate 14, so that the conventional wireless charging sensor board has a thickness of at least 4 layers or more.

Since the high-order wireless charging module has high requirements for high transmission efficiency and better heat dissipation, the coil impedance of the printed circuit board must be very low, but the wireless charging technology uses high-frequency alternating current (AC). Therefore, the transmission efficiency is related to the matching of the frequency and inductance of the coil. The "Proximity Effect" of the electromagnetic field is formed between the tight loops of the coil or between the coils that overlap each other, which makes the coil The impedance increases and the inductance value fluctuates, and the heat dissipation is poor. Therefore, it is an urgent problem to be solved for the high-order wireless charging module.

The main purpose of this creation is to solve the structure of the wireless charging coil of the conventional printed circuit board. Because of the "Proximity Effect" between the coil wires, the main technical feature of the present invention is to provide a wireless charging printed circuit board coil structure. Included that at least one first coil is distributed on the first layer of the printed circuit board, and at the center or periphery of the undistributed wire is a first empty window region; at least one second coil is distributed on the second layer of the printed circuit board, And the second empty window area is at the center or the periphery of the unwired wire; the plurality of first wires are distributed in the first empty window area, and a part of the wires corresponding to the second coil have a plurality of electrical connection points with the second coil, Electrically parallelizing the first wire and the partial wire of the second coil; and the plurality of second wires are distributed in the second empty window region, corresponding to the partial wire of the first coil, and having a plurality of electrical connection points with the first coil, electrical Parallel second guide a wire and a portion of the wire of the first coil, thereby increasing the amount of charge of the coil, reducing the impedance to overcome the "Proximity Effect" between the coil wires, and adjusting, balancing, or increasing the number of wires passing through the empty window region The inductance value (Ls) of the coil.

In order to achieve the above object, the secondary technical feature of the present invention is to provide the above-mentioned wireless charging printed circuit board coil structure, and further comprising at least a third coil distributed on the third layer of the printed circuit board, at the center or periphery of the undistributed wire a third empty window region, and a part of the wire of the third coil corresponds to the second wire, and has a plurality of electrical connection points with the second wire, electrically connecting the partial wire and the second wire of the third coil; and the plurality of third wires Distributing in the third empty window region, a part of the wire corresponding to the second coil has a plurality of electrical connection points with the second coil, and electrically connecting the third wire and the partial wire of the second coil.

Another technical feature of the present invention is to provide the above-mentioned wireless charging printed circuit board coil structure, further comprising at least one fourth coil distributed on the fourth layer of the printed circuit board, the center of the undistributed wire or the periphery of the fourth empty window region a part of the wire of the fourth coil corresponds to the third wire, and has a plurality of electrical connection points with the third wire, electrically connecting the partial wire of the fourth coil and the third wire; and the plurality of fourth wires are distributed in the fourth air window a portion of the wire corresponding to the third coil has a plurality of electrical connection points with the third coil, and electrically connects the fourth wire and the partial wire of the third coil.

A further technical feature of the present invention is to provide the above-mentioned wireless charging printed circuit board coil structure, wherein the electrical connection point is set in the first, Both ends or/and a middle portion of the second, third or fourth wire.

10‧‧‧Power transmission module

11,11’,11”‧‧‧ transmit coil

12‧‧‧Transmission sensor board

13,13’‧‧‧ empty window area

14‧‧‧ top board

30‧‧‧Printed circuit board

31‧‧‧Upper surface

32‧‧‧Under surface

33‧‧‧The first empty window area

33’‧‧‧ at the center of the first coil

33”‧‧‧The periphery of the first coil

34‧‧‧Second empty window area

34’‧‧‧ at the center of the second coil

34”‧‧‧The outer circumference of the second coil

41,71‧‧‧first coil

42,72‧‧‧second coil

43,81‧‧‧First wire

44,82‧‧‧second wire

45‧‧‧Electrical connection point

73‧‧‧third coil

74‧‧‧fourth coil

75‧‧‧ fifth coil

76‧‧‧ sixth coil

83‧‧‧ Third wire

84‧‧‧fourth wire

85‧‧‧ fifth wire

86‧‧‧6th wire

Figure 1 is a schematic diagram of a conventional wireless charging transmission; Figure 2 is a schematic diagram of an induction board having two sets of coils; Figure 3 is a schematic diagram of an induction board having three sets of coils; and Figure 4 is a conventional three-group coil sensing board. Figure 5A, B is a top view and a bottom view of the two sets of coil structure of the two-layer printed circuit board; Figure 6A and B are the 6A-6A cross-section and figure of Figure 5A. FIG. 7A and FIG. 6B are schematic diagrams showing the uppermost surface of the printed circuit board and the lowermost surface of the printed circuit board of the embodiment of the present invention; and FIG. 8 is a partial cross section of the multilayer printed circuit board. Side view.

In order to enable your review board to further understand the techniques, means and effects of this creation in order to achieve the intended purpose, please refer to the following detailed description and drawings of this creation, and believe that the purpose, characteristics and characteristics of this creation can be An in-depth and specific understanding is provided, however, the drawings are provided for reference and description only and are not intended to limit the invention.

This creation is mainly to solve the printed circuit in the wireless charging sensor board. The "Proximity Effect" of the plate coil reduces the impedance value of the coil. However, the number of coils of the embodiment exemplified in the present invention is not limited by the following description.

First, please refer to FIG. 5A and FIG. 5B. FIG. 5A is a top view of the two sets of coil structures of the double-layer printed circuit board, and FIG. 5B is a bottom view. The wireless charging induction coil structure of the present invention comprises a printed circuit board 30 having an upper surface 31 and a lower surface 32, wherein at least one first coil 41 is wound on the upper surface 31 and wound into a concentric axis, and distributed on the lower surface 32. At least one second coil 42 is wound into a concentric shaft, and the printed circuit board 30 is disposed on a core board (not shown) to form a wirelessly charged sensor board. In the embodiment of the present invention, the shape of the first coil 41 and the second line 42 may be rectangular, circular, elliptical or polygonal, etc., and the winding of the first coil 41 and the second coil 42 is created. The shape and size may be the same or different, and may vary depending on the shape and size of the printed circuit board, and are not limited to the embodiments listed in the present application.

In the embodiment of FIG. 5, the first coil 41 is distributed on the upper surface 31 of the printed circuit board 30, and the area on the upper surface 31 where the first coil 41 is not distributed is an empty window region where power cannot be transmitted. Therefore, the present creation is defined as the first empty window region 33, such as the center 33' of the wire winding of the first coil 41, or the periphery 33" as the wire of the first coil 41 does not pass. Similarly, the second coil 42 described above Is distributed on the lower surface 32 of the printed circuit board 30, and the area where the second coil 42 is not distributed on the lower surface 32 is defined as the second empty window region 34, such as the second line The circle 42 is at the center of the wire winding 34', or the periphery of the second coil 42 is not passed 34". In the present embodiment, the first coil 41 and the second coil 42 are relatively staggered, in other words, The wire of the first coil 41 passes through the two-empty window region 34 at the center 34' of the second coil 42 and at the periphery 34". The wire of the second coil 42 passes through the center 33' of the first coil 41 and the first window portion 33 of the peripheral region 33", so that the entire printed circuit board of the present invention does not have an empty window region of the induction coil.

As shown in the embodiment of FIGS. 5A and B, the present invention uses the first empty window region 33 of the upper surface 31 of the printed circuit board 30 and the second empty window region 34 of the second layer surface 32 to respectively provide a plurality of first wires. 43 and a plurality of second wires 44, wherein the first wires 43 are distributed in the first empty window region 33, such as distributed at the center 33' of the first coil 41 or distributed at the periphery 33 of the first coil 41, And corresponding to a part of the wires of the second coil 42 , a plurality of electrical connection points 45 are disposed at the two ends or the middle portion or any portion of the first wires 43 , and are electrically connected to the first coil 41 through the printed circuit board. Corresponding wire, as shown in FIG. 6A, is a schematic view of a 6A-6A cross-section of the center 33' of the first coil 41 of FIG. 5A, wherein the first wire 43 has two electrical connection points 45, which are respectively disposed in the first Both ends of a wire 43 are electrically connected to a portion of the wires of the second coil 42 such that the first wires 43 are connected in parallel with a portion of the wires of the second coil 41.

The second wires 44 are distributed in the second empty window region 34, such as at the center 34' of the second coil 42 or at the periphery 34 of the second coil 42, and correspond to the first coil 41. Part of the wire, the second wire 44 A plurality of electrical connection points 45 are disposed at the ends or the middle portions or anywhere, and are electrically connected to the wires corresponding to the second coils 42 through the printed circuit board, as shown in FIG. 6B, which is the second coil 42 of FIG. 6B-6B cross-sectional view of the periphery 34", wherein the second wire 44 has three electrical connection points 45, which are respectively disposed at the two ends of the first wire and the middle portion of the first wire is electrically connected to the partial wire of the first coil 41 The second wires 44 are connected in parallel with the partial wires of the first coil 41. The partial wires of the first coil 41 and the second coil 42 can be electrically connected to the first wire 43 and the second wire 44. The amount of electric charge transmitted by a large electric charge reduces the impedance of a part of the wire of the coil, thereby overcoming the "Proximity Effect" of the coil, and the coil wire in the empty window area can balance the inductance value of the coil or increase the inductance of the coil. The value can also be adjusted by the different number of coil wires in the empty window area.

Then, the creation of the three sets of coil structure of the multilayer printed circuit board is taken as an example. Please refer to FIG. 7A, FIG. 7B and FIG. 8 together. FIG. 7A is the most printed circuit board of the embodiment of the multi-group coil. Schematic diagram of the upper surface, FIG. 7B is a schematic view of the lowermost surface, and FIG. 8 is a partial cross-sectional side view of the multilayer printed circuit board of the embodiment of FIGS. 7A and B. In this embodiment, the present invention includes six sets of coils respectively distributed in four layers of printed circuit boards, wherein the first layer (uppermost layer) of the printed circuit board 30 is provided with a first coil 71, a second coil 72 and a first surface. a wire 81 (as shown in FIG. 7A), a second layer of the printed circuit board 30 is distributed with a third coil 73, a second wire 82 and a third wire 83. The third layer of the printed circuit board 30 is distributed with a fourth coil 74, Five coils 75 and fourth wires 84, of printed circuit board 30 The fourth layer (lowest layer) is provided with a sixth coil 76, a fifth wire 85 and a sixth wire 86 (as shown in FIG. 7B).

In the embodiment of the present invention, the plurality of first wires 81 of the first layer (uppermost layer) of the printed circuit board 30 are disposed in the central empty window region or the peripheral region of the first coil 71 and the second coil 72 (eg, 7A and FIG. 8), the plurality of second wires 82 and the plurality of third wires 83 of the second layer of the printed circuit board 30 are disposed in the central empty window region or the peripheral region of the third coil 73 (equivalent to FIG. 7B and As shown in FIG. 8), the plurality of fourth wires 84 of the third layer of the printed circuit board 30 are disposed in the central empty window region or the peripheral region of the fourth coil 74 and the fifth coil 75 (equivalent to FIG. 7A and FIG. The plurality of fifth wires 85 and the plurality of sixth wires 86 of the fourth layer (lowest layer) of the printed circuit board 30 are disposed in the central empty window region or the peripheral region of the sixth coil 76 (as shown in FIGS. 7B and 8). .

Wherein a plurality of electrical connection points 45 are formed between the first wire to the second layer of the printed circuit board 30 between a portion of the wires of the first coil 71 of the first layer of the printed circuit board 30 and the second wire 82 of the corresponding second layer. A portion of the wires of the first coil 71 are electrically connected in parallel to the corresponding second wire 82. The second wire 82 is further provided with a plurality of electrical connection points 45 through the second layer and the third layer between the partial wires of the fourth coil 74 of the third layer, so that the second wire 82 is electrically connected in parallel to the corresponding fourth. A portion of the wire of coil 74. A plurality of electrical connection points 45 are also provided between the partial wires of the fourth coil 74 and the fifth wire 85 of the corresponding fourth layer through the third layer and the fourth layer, so that the partial wires of the fourth coil 74 are electrically connected in parallel. The corresponding fifth wire 85, in other words, the first coil 71 is electrically connected in parallel to the fourth coil 74.

Similarly, a plurality of electrical connection points 45 are formed between the partial wires of the second coil 72 of the first layer of the printed circuit board 30 and the third wires 83 of the corresponding second layer, and the first layer to the second layer are formed. A part of the wires of the two coils 72 are electrically connected in parallel to the corresponding third wires 83. The second wire 83 is further provided with a plurality of electrical connection points 45 through the second layer to the third layer between the partial wires of the fifth coil 75 of the third layer, so that the third wire 83 is electrically connected in parallel to the corresponding first Five coils 75. A plurality of electrical connection points 45 are also provided between the partial wires of the fifth coil 75 and the sixth wire 85 of the corresponding fourth layer through the third layer to the fourth layer, so that the partial wires of the fifth coil 75 are electrically connected in parallel. The corresponding sixth wire 86, in other words, the second coil 72 is electrically connected in parallel to the fifth coil 75.

Further, a plurality of electrical connection points 45 are formed between the first wire 81 of the first layer of the printed circuit board 30 and a portion of the wires of the corresponding third coil 73 to penetrate the first layer to the second layer, so that the first wire 81 is electrically connected. A part of the wires connected in parallel to the corresponding third coil 73. A part of the wires of the third coil 73 and the fourth wire 84 of the corresponding third layer are respectively provided with a plurality of electrical connection points 45 extending through the second layer to the third layer, so that the partial wires of the third coil 74 are electrically connected in parallel. Corresponding to the fourth conductor 84 of the third layer. A fourth electrical conductor is disposed between the fourth conductor 84 and a portion of the conductor of the sixth coil 76 of the corresponding fourth layer. The fourth electrical conductor is electrically connected in parallel to the sixth coil. A portion of the wire of 76, in other words, the third coil 73 is electrically coupled in parallel with the sixth coil 76.

It can be seen from the above embodiments that the six sets of coils on the printed circuit board of the present invention are actually only three groups, and the coils of different layers can be connected in parallel to increase The amount of charge in the coil to reduce the group resistance of the coil, thereby overcoming the "Proximity Effect" between the coils. In the present embodiment, the printed circuit board 30 has two sets of complete coils on the uppermost layer, and the lower coils also have partial conductors connected in parallel to the uppermost conductors, and are distributed in the empty window area of the uppermost coil. The coil of the present creation has no empty window area at all, and all the coils can be distributed as much as possible on the uppermost layer, as close as possible to the receiving end of the wireless power, so as to improve the power transmission efficiency. Of course, in other embodiments of the present invention, more than three sets of coils may be used in a larger printed circuit board, such as four sets of coils, five sets of coils, etc., and more than four layers of printed circuit boards may be used, such as six. The layer, the eight-layer board, and the like, therefore, the number and distribution of the coils of the present creation are completely changed according to requirements, and are not limited to the embodiment of the present creation.

In summary, this creation provides a design that is quite different from the well-known ones, which can improve the overall use value, and is not seen in the publication or public use before the application. Cheng has already met the requirements of the new patent, and proposed a new patent application according to law. . However, the above-mentioned drawings and descriptions are only examples of the present invention, and those skilled in the art can make other improvements according to the above description, and these changes still belong to the spirit of the creation and the following Within the scope of the defined patent.

30‧‧‧Printed circuit board

31‧‧‧Upper surface

33‧‧‧The first empty window area

33’‧‧‧ at the center of the first coil

33”‧‧‧The periphery of the first coil

41‧‧‧First coil

43‧‧‧First wire

Claims (10)

A wireless charging printed circuit board coil structure comprising: at least one first coil distributed on a first layer of a printed circuit board, wherein a center or a periphery of the undistributed wire of the first coil is a first empty window region; At least one second coil is distributed on a second layer of the printed circuit board, wherein a center or periphery of the undistributed wire of the second coil is a second empty window region; a plurality of first wires are distributed in the first space a window portion, and a portion of the wires of the second coil, and a plurality of electrical connection points between the first wires and the second coil, the first layer and the second layer are electrically connected in parallel a wire and a part of the wire of the second coil; and a plurality of second wires distributed in the second air window region, and corresponding to a part of the wires of the first coil, and the plurality of second wires and the first coil have a plurality of wires An electrical connection point extends through the first layer and the second layer, electrically connecting the second wires and a portion of the wires of the first coil. The wireless charging printed circuit board coil structure of claim 1, wherein the first layer of the printed circuit board is the uppermost layer and the second layer is the lowermost layer. The wireless charging printed circuit board coil structure of claim 1, further comprising: at least one third coil distributed on a third layer of the printed circuit board, wherein The center of the third coil undistributed wire or the periphery is a third empty window region, a part of the wires of the third coil correspond to the second wires, and the third coil and the second wires have a plurality of electrical properties a connecting point penetrating the second layer and the third layer, electrically connecting a part of the wires of the third coil and the second wires; and a plurality of third wires distributed in the third empty window region, and corresponding to the second layer a portion of the wire of the coil, and a plurality of electrical connection points between the third wire and the second coil extending through the second layer and the third layer, electrically connecting the third wire and the portion of the second coil wire. The wireless charging printed circuit board coil structure of claim 3, further comprising: at least one fourth coil distributed on a fourth layer of the printed circuit board, wherein the fourth layer of the coil is undistributed The fourth or the outer periphery of the fourth coil is a portion of the wire of the fourth coil corresponding to the third wire, and the fourth coil and the third wire have a plurality of electrical connection points extending through the third layer to The fourth layer electrically connecting a part of the wires of the fourth coil and the third wires; and a plurality of fourth wires distributed in the fourth empty window region, and corresponding to the partial wires of the third coil, and the A plurality of electrical connection points are formed between the fourth wire and the third coil through the third layer to the fourth layer, and the fourth wires and the partial wires of the third coil are electrically connected in parallel. Wireless charging printed circuit board coil junction as described in claim 4 The first layer of the printed circuit board is the uppermost layer, the second layer and the third layer are the intermediate layer, and the fourth layer is the lowermost layer. The wireless charging printed circuit board coil structure of claim 4, wherein the electrical connection points are disposed at both ends of the first, second, third or fourth wires. The wireless charging printed circuit board coil structure of claim 4, wherein the electrical connection points are disposed in the middle portion of the first, second, third or fourth wires. The wireless charging printed circuit board coil structure of claim 4, wherein the first, second, third or fourth coils are wound in a shape of a rectangle, a circle, an ellipse or a polygon. The wireless charging printed circuit board coil structure of claim 4, wherein the first, second, third, and fourth coils are different in size and shape. The wireless charging printed circuit board coil structure of claim 4, wherein the printed circuit board is disposed on a core plate.